<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <script src="script/jquery-3.5.1.js"></script>
        <script>
            $(function() {
                alert("Hello world!")
            })
        </script>
    </head>
    <body>
        <h1>a01_helloworld</h1>
        展示ready时执行函数.
    </body>
</html>
